水库型饮用水源浊度时空变化及分区识别研究

Research on Spatial-temporal Variation of Turbidity and Zonal Identification in Reservoir Drinking Water Source

饮用水源水体清澈是保障饮用水安全的重要要求,连续监测水源地水体浊度可为饮水安全提供有力数据参考。实地监测浙江省温州市饮用水源珊溪水库、赵山渡水库及入库支流2017~2019年的全区域水体浊度,应用层次聚类分析法研究了水体浊度时空分布特征及变化规律。结果表明,珊溪水源水体浊度具有显著的时空差异性;赵山渡水库水体浊度夏季>冬季>秋季>春季;珊溪水库全年浊度低于5 NTU,夏季>春季>秋季=冬季;入库河流除秋季低于5 NTU外,其他季节都超过5 NTU。2017~2019年间玉泉溪和赵山渡水库浊度始终较高,三插溪近年出现浊度异常情况。总体来说,水源地年度水体浊度变化特征为赵山渡水库库区入库河流≥赵山渡水库库区>飞云江>珊溪水库库区入库河流>珊溪水库库区。珊溪水源水体浊度层次聚类分析表明,时间上将监测时间划分为高浊期(2018年7月)和低浊期(其他监测季节);空间上将浊度监测水域分为高浊区(赵山渡水库及其入库支流玉泉溪、泗溪)、中浊区(飞云江)和低浊区(珊溪水库及其入库支流三插溪、黄坦坑、峃作口溪、莒江溪、洪口溪),分类大致符合各断面的地理位置分布;需对高浊区与高浊期及浊度异常区加强管理。

It is important to ensure the clarity of drinking water source.Continuous monitoring of water turbidity in water source can provide powerful data reference for drinking water safety.Based on the field monitoring of water turbidity in drinking water source in Wenzhou City,Zhejiang Province,Shanxi Reservoir,Zhaoshandu Resevior and tributaries,from 2017 to 2019,the temporal and spatial distribution characteristics and variation rules of water turbidity were studied by hierarchical cluster analysis method.The results show that the turbidity in drinking water source has significant differences in time and space.The turbidity of Zhaoshandu reservoir is in summer>winter>autumn>spring.The turbidity of Shanxi reservoir in the whole year is lower than 5 NTU,and in summer>spring>autumn=winter.The inflow rivers exceed 5 NTU in other seasons except that it is lower than 5 NTU in autumn.The turbidity of Yuquan stream and Zhaoshandu Reservoirs is always high from 2017 to 2019,and the turbidity of Sancha stream is abnormal in recent years.Generally speaking,the annual turbidity change of water body in drinking water source is characterized by the tributaries of Zhaoshandu Reservoir Area≥Zhaoshandu Reservoir Area>Feiyun River>the tributaries of Shanxi Reservoir Area>Shanxi Reservoir Area.The study applied a hierarchical cluster analysis on turbidity in drinking water source.The monitoring time is divided into high turbidity period(July 2018)and low turbidity period(other monitoring seasons).The turbidity monitoring water in sapce is divided into high turbidity area(Zhaoshandu Reservoir and Yuquan stream and Si stream),medium turbidity area(Feiyun River)and low turbidity area(Shanxi Reservoir and Sancha stream,Huangtankeng,Xuezuokou,Jujiang stream and Hongkou stream).The classification roughly conforms to the geographical location distribution of each section.It is necessary to strengthen the management of high turbidity area,high turbidity period and abnormal turbidity area.